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zpacks ridgeline is 2 inches longer.
stormcrow's will be about .2oz lighter after seam sealing joe's
stormcrow's slightly more expensive ($25 more)
zpacks has much more long-term experience with cuben
zpacks ridgeline is sewn and stormcrow's is glued
stormcrow's wait period is shorter

both businesses have earned my repeat business. both owners have humbly yielded a series of questions from me. there is no clear-cut front runner for me.

zpacks ridgeline is 2 inches longer.
stormcrow's will be about .2oz lighter after seam sealing joe's
stormcrow's slightly more expensive ($25 more)
zpacks has much more long-term experience with cuben
zpacks ridgeline is sewn and stormcrow's is glued
stormcrow's wait period is shorter

if it were me, and taking into account i dont even know what cuben is aside from a really expensive/light/kinda thin material, this is how id break it down with that info:

2" really isnt going to make that much difference at 1" an end BUT
they have more experience and its sewed. those to me seem to be deciding factors that would make it worth the wait. as they say, anything good is worth waiting for...

Give a man fire and he's warm for the night.
Set a man on fire and he's warm for the rest of his life. Dante

Thanks, but I'm not quite that advanced. On reflection, this may be a case of two methods to do the same task, in which one may be better than the other, but both are perfectly adequate. I haven't heard any tales of sewn tarp seams failing, though rigorous tests could make them seem weaker. The seam sealing (depending on method) could add strength, I suppose, but it's another factor that needs to be done right.

Taped or glued seams no doubt. It's more durable than a sewn seam on cuben.

Fulfillment is living a life that makes the lives of others worth living.
DIY is addicting and fulfilling!
"If guns kill people, then pencils mispell words, cars cause people to drink and drive, and spoons made Rosie O'donnell fat."

If cuben is a non-woven fabric I would go with glued. Non-wovens can be unpredictable with sewing. I'm not suggesting the sewn seams would be inadequate. Simply that I would feel better with the glued.

I may be slow... But I sure am gimpy.

"Bless you child, when you set out to thread a needle don't hold the thread still and fetch the needle up to it; hold the needle still and poke the thread at it; that's the way a woman most always does, but a man always does t'other way."
Mrs. Loftus to Huck Finn